Rod-bending machine.



W. B. MYERS.

BOD BENDING MACHINE. APPLICATION rLED Aua.24. |915.

Patented Feb. 27, 1917.

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WALKER B. MYERS, F DENVER, COLORADO.

ROD-BENDING MACHINE.

' ver, in the county of Denver and State of Colorado, have inventedcertain new and useful'lmprovements in Rod-Bending Machines, of whichthe following is a specification.

This invention relates to a rod-bending machine, and its principalobject resides in providing a mechanism of simple construction which initsV operation bends rods to one or more angles of any desired size:

The machine is more particularly designed to form steel and iron rodsfor use as reinforcements in concrete and cement structures, and it isprovided with suitable' adjustments to determine the angles atwhich therods are to be bent, and with gages which p j which is held stationaryin a rod-rest hereestablish the correct distances between a plurality ofbends in one rod.

'The above and other objects all of which will fully appear in thefollowing description, attain by the mechanism'illustrated in theaccompanying drawings in the various views of which like parts aresimilarly designated, and in which,

Figure 1 is a plan view of the machine,

Fig. 2, a side elevation of the same,

Fig. 3, an enlargedplan view of the operating mechanism of the machine,

Fig. 4, a section taken along the line 1 -4, 'pig' 3 j n Fig. 5, 'asection along the line 5 5, Fig. 4, and

Fig. 6, a fragmentary plan view of the mechanism shown-in Fig. 3 withthe parts of the operating mechanism in the positionsv they assumeduring the bending process.

Referring more 'specically to the drawings, the reference numeral 2designates a table mounted upon a suitable supporting structure 3, andprovided with an extension 4 for the support of the portion of vtherodthat is being bent at an angle to its body portion.

Mounted in suitable bearings is an upright shaft 5 which at a point nearthe foot of the supporting structure is provided with' a beveled gearwheel 6. A beveled pinion 7 meshing with the gear-wheel 6 is mountedupon a horizontal shaft which through the Specification of LettersPatent.

Patented'Feb. 27,1917.

Application led August 24, 1915. l Serial No. 47,034.

instrumentality of a gearingS and a pulley 9 is operatively connectedwith amotor 10.

Mounted upon the upright shaft beneath and inadjaeency to the table 2 isa ratchetwheel 12 which in the operation serves to transmit the rotarymovement of the shaft to the bending element of the machine.

This'element consists of a swinging arm 13 which is'pivoted on the shaft5 beneath 4the ratchet wheel and is slidably supported upon a shelf 14liXed on the supporting structure beneath the table.

The arm is provided with an upright stud 15 upon which is pivote'd 'apawl 1G which rests upon'the arm. The'upper end of the stud projectingabove the pawl carries an antifriction roller 17 which in the operationof the machine engages the rod to bend a art thereof relative to thebody portion inafter to be described. .j

A link 18 positioned above the .pawl and the ratchet'whe'el is pivoted`upon the stud 15 and the shaft' to more firmly maintain the parts intheir relative positions, and an arcuated'slot 19 in the table formedconcentrically to the upright shaft, guides the roller 17 projectingtherethrough, during movement ofthe arm about its pivotal axis.

A holder 20 pivotedl on the shaft 5 between the armv and the tablecarries at`its end which projects beyond the hub ofthe arm, a pivotedtrip 21 which by means of a spring 22 isyieldingly-heldin its normalposition. v

. The trip is provided intermediate of its ends with 'a laterallyprojecting lug 23 which at a determinate point in the rotary movelmentof the arm, ,is engaged by a cam 24 projecting laterally from the same.

' TheV pawl 16 has a point l25 adapted to engage with theteethof theratchet wheel,

Vand'it is'furthermore providedV with a tail 26 which when by engagementof the cam 24 with the lug 23 on the trip, the latter is moved about itspivot, engages an antifriction roller ,27 on the trip for the purpose ofdisengaging the point of the pawl from the tooth of the ratchet-wheelwith which it was in contact.

A handle 28 projecting from the pawl, lis provided for its adjustment tomove the point 25 in engagement with the ratchet wheel 12, and coiledsprings 29 and 30 which respectively connect the handle of the pawl withthe arm, and the arm 13 with a fastening 31 on the table, serve toautomatically return the parts to their original position after the pawlis released from the ratchet wheel by the engagement of its tail withthe roller on the trip.

The rod-rest which holds the body portion of the rod in a fixed positionduring the bending operation, consists or" a slotted plate 32 which isslidably-adjustably mounted upon the table by means of bolts 33 and 34extending through its slots, nuts screwed upon the bolts being providedto lock the plate in its adjusted positions.

A stop on the table engages an edge of the plate to hold it againstlateral displacement and bolt-holes 36 in the table are pr vided toadmit the rearmost bolt 34 when for the purpose of adjusting theposition of the bending shoulder hereinafter to be described, relativeto the bending roller 15, the

plate is adjusted by moving it pivotally about its other bolt 33.V

r1`he rod-rest has at its forward end an upwardly projecting stationarycheek 37 the end of which provides a shoulder 33 about which'theprojecting portion of a rod placed on the rest, is bent by action of theroller 17 on the swinging arm.

A second cheek 39 slidably mounted in a slot of a rib 40 on the restopposite to and parallel with the stationary cheek 37, is adjustable bymeans of a pair of screws 41 extending through threaded apertures in therib and provides in conjunction with the other cheek, a seat 42 toreceive the bodyportion of the rod and hold the same against lateraldisplacement.

The rest is furthermore provided at its rear end with a laterallyprojecting sleeve 43 in which a plurality of bars 44 are held in placeby means of a set-screw 45.

The gage bars have at their forward ends, upwardly proj ecting' prongs46 which by engagement with a bend previously formed on a rod, establisha predetermined distance between the` said bend and `a second bend to beformed on the rod by action of the swinging upon its portion projectingbeyond the shoulder 38.

The trip 21 is adjusted to different positions in a path concentric tothe course of travel of the swinging arm, in accordance with the size ofthe angle to which it is desired to bend the rod, by means of a curvedbar 47 which is pivoted at one of its ends upon the pivot-pin of thetrip, and which extends slidingly through a guide-slot 48 on the table.V

The bar is serrated at its outer edge and held in its adjusted positionsby engagement with a detent 49 which forms part of a pivoted block 50which rests upon the table. n screw 51 extending through a threadedopening' in a lufy 52 projecting upwardly from the table, engages theblock 50 to provide for a limited lateral adjustment of the detent.

1n operation, the movable cheek 39 of the rod-rest is adjusted to adistance from the stationary cheek 37 of the same, slightly exceedingthe width of the rod to'be bent. rEhe trip 21 is positioned withrelation to the shoulder 38 in accordance with the angle to which therod is to be bent, by moving the holder 2O about its pivot through themedium of the curved bar 47, and the latter is subsequently locked'inposition by engagement with the detent 49.

After the motor 10 has been put in motion to impart a rotary movement tothe upright shaft 5, the rod which in Figs. 1, 2 and 6 of the drawingshas been designated by the numeral 53, is slid through the seat 42 onthe rod-rest until the point at which it is to be bent is in line withthe shoulder 38.

The pawl 16 is now moved about its pivot by means ot' the handle 28 tobring its point 25 in engagement with the rotating ratchet wheel 12,withthe result that the arm 13 is swung about its pivot and the roller17 is compelled to forcibly engage the part of the rod extending beyondthe shoulder.

lnasmuch as the body portion of the rod is held against lateral movementin the seat 42, its projecting end is by the action of the wheel.

After the pawl has been released, the springs 29 and 30 which wereexpanded during the above described operation, automatically return boththe pawl and the arm 13 to their original positions.

The angle at which the rod is to be bent may be varied to substantiallyany desired degree by the adjustments of the trip and the rod-rest, theadjustment of the detent 49 being provided to secure the trip at anypoint at which the detent in its normal position would engage aserration of the bar 47 between two of its interdental spaces.

lfhen a number of rods are to be former alike by a plurality of bends,the distances between each bend and a succeeding' one is gaged byplacing the rods so that the bends already formed thereon, engage theupright prong on one of the gage bars which previously has been adjustedto the required distance with relation to the shoulder 38. rthe positionoccupied by the rod has been shown in broken lines at 55 in Fig. 3.

By providing a number of gages as shown in the drawings a number ofsuccessive, differently distanced bends may thus be formed on a number`of rods without the necessity of adjusting a gage for each differentbend.

Having thus described my rod-bending machine in the best form at presentknown to me 1 desire it understood that variations in the arrangementand construction Vof cooperative parts of which the machine is composed,may be resorted to within the spirit of my invention as set forthv inthe following claims l. A rod-bending machine comprising a support, abending-shoulder thereon, a pivoted arm having a bending-member toengage a portion of a rod extending beyond the shoulder, a rotaryratchet wheel, a pawl pivoted on the arm for engagement with theratchet-wheel, and a trip adapted to disengage the pawl from theratchet-wheel at a determinate point in the movement imparted to the armby engagement of the pawl with the ratchet-wheel.

2. A rod-bending machine comprising a support, a bending-shoulderthereon, a pivoted arm having a bending-member to engage a portion of arod extending beyond the shoulder, a driving element having a continuousrotary movement in one direction, a transmission-member adjustable onthe arm, to drive the same by engagement with the said element, a tripadapted to automatically disengage the transmission member from thedriving-element at a Vdeterminate point in the movement of the arm withthe element, and resilient means for returnng'the arm and thetransmission-member to their original positions.

3. A rod-bending machine comprising a support, a bending-shoulderthereon, a pivoted arm having a bending-member to engage a portion of arod extending beyond the shoulder, a driving element having a continuousrotary movement in one direction, a transmission-member adjustable onthe arm, to drive the same by engagement with the said element, a tripadjustable to a selected position in a path concentric with the courseof travel of the arm, and adapted to automatically disengage thetransmission member from the driving-element, and means for securing thetrip in its adjusted positions.

4. A rod-bending machine comprising a support, a bending-shoulderthereon, a pivoted arm having a bending-member to engage a portion of arod extending beyond the shoulder, a rotary driving element, atransmission-member adjustable on the arm, to drive the same byengagement with the said element, atrip adjustable to a selectedposition in a path concentric with the course of travel of the arm, andadapted to disengage the transmission member from the drivingelement, atoothed bar connected with the of power to the shaft, a toothed-wheel onthe shaft, an arm pivoted on the shaft and having a bending member toengage the portion of a rod extending beyond the shoulder, a

' pawl pivoted on the arm to engage s aid toothed wheel, and a trip fordisengaging the pawl from the wheel at a determinate point in themovement of the arm with the wheel. l

6. A rod-bending machine comprising a support, a bending-shoulderthereon, an upright shaft, mechanism for the transmission of power tothe shaft, a toothed-wheel on the shaft, an arm pivoted on the shaft andhaving a bending-member to engage the portion of a rod extending beyondthe shoulder, a pawl pivoted on the arm to engage said toothed wheel, atrip-holder pivoted on the shaft, a trip on said holder adapted todisengage the pawl from the wheel at a selected point in the movement ofthe arm with the wheel, and means for securing the tripholder in itsadjusted positions.

7 A rod-bending machine comprising a support, a bending-shoulderthereon, an upright shaft, mechanism for the transmission of power tothe shaft, a toothed wheell on the shaft, an arm pivoted on the shaftand having a bending-member to engage the portion of a rod extendingbeyond the shoulder, a pawl pivoted on the arm to engage said toothedwheel, a trip-holder pivoted on the shaft, a trip on said holder adaptedto disengage the pawl from the wheel at a selected point in the movementof the arm with the wheel, a toothed rod pivoted on said holder, and adetent for securing said rod in its adjusted positions.

8. A rod-bending machine comprising a support, a bending-shoulderthereon, an upright shaft, mechanism for the transmission of power tothe shaft, a toothed wheel on the shaft, an arm pivoted on the shaft andhaving a bending-member to engage the portion of a rod extending beyondthe shoulder, a pawl pivoted on the arm to engage said toothed wheel, atrip-holder pivoted on the shaft, a trip pivoted on said holder andadapted to disengage the pawl from the wheel, and means for securing thetripholder in its adjusted positions, the said trip and the arm havingcooperative means which by engagement at a determinate point in themovement of the arm, compel the trip to move into the path of the pawl.

9. A rod-bending machine comprising a support, a bending-shoulderthereon, an upright shaft, mechanism for the transmission and springsfor returning the pawl and the arm to their original positions.

n testimony whereof I have eiiXed my signature in presence of twowitnesses.

WALKER B. MYERS.

of power to the shaft, a toothed-wheel on the shaft, an aim pivoted onthe shaft and having e bending-inemhei to engage the potion of e rodextending beyond the shoulder, a pawl pivoted on the arm to engage saidtoothed wheel, a trip for disengaging the pawl from the wheel at adeteiniinate point in the movement of the arm with the wheel,

/Vitnesses:

G. J. ROLLANDET, L. RHOADES.

Copies of this patent may be obtained for ve cents each, by addressingthe "Commissioner of Patents.

Y Washington, D. C.

